First I have to say, I wish everyone sending pictures of a tire condition took as good pictures as Jim did.
Well lit and close enough to clearly see the condition in question.
Anyway, here was my reply:
” Jim, Glad you enjoyed the seminar. Yes that is classical “Rivering”. This is not something that only happens to Goodyear tires but is also seen on other brands. Its also not seen on all Goodyears either. It is a combination of tread pattern (design) and the selection of components and materials for the tire specification and the suspension characteristics of the vehicle. We design engineers do work at avoiding it but it is something that doesn’t normally show up in our accelerated testing early in the design process so sometimes we can not “fix” it.
The best thing you could do is to swap out the two fronts for one of the set of duals. Now you do need to confirm the OD of the two tires going on as a set of duals is within 1/4″. The best way to confirm that is to measure the Outside Circumference while fully inflated and confirm the OC is within 3/4″ of each other. Do the measurement before any tire dismounting is done to save $.
I did a post or two on my blog and even a YouTube video on RVTravel channel on the topic and importance of matching duals. Just select from the list of “labels” displayed on the right side of my blog page for all the posts concerning DUALS.
Hope this helps.”